Re: [RFC PATCH 31/56] x86/alternative: Prepend nops with retpolines

Peter Zijlstra
2025-10-16T11:09:06Z

On Thu, Oct 16, 2025 at 12:32:33PM +0200, Peter Zijlstra wrote:

> Alas, some micro-archs have significant decode penalties for >3
> prefixes, and filling 6 bytes will need 4 prefixes :-(

N/m this, because if it has 6 bytes, then the indirect call will need 3
bytes and we're back to needing 3 prefixes.